Safety snap-hook.



P. L. PLANK;

. SAFETY SNAP HOOK. APPLICATION FILED FE 28. 191B- RENEWED NOV. Is.1916.

15,293,543. Patented Feb. 4,1919.

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- ITED STATES SAFETY SNAP-HOOK.

Specification .of Letters Patent.

Patented Feb. 4,1919.

Application filed February 28, 1918, Serial No. 219,636. RenewedNovember16, 1918. Serial No. 262,906.

To all whom it may concern:

Be it knownthat I, PRYOR L. PLANK, a citizen of the United States,residing at Enterprisefin'the county of W allowa and State of Oregon,have invented certain new and useful Improvements in Safety Snap-Hooksand I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference beinghadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

- This invention relates to new and useful improvements in safety snaphooks and con sists of a simple and efficient device of this nature soarranged that the hook may be easily and quickly released by slightturning of a sleeve forming a part of the same.

The invention consists of further details of construction, combinationsand arrangements of parts which will be hereinafter fully described,shown in the accompanying drawings and then specifically defined in theappended claims.

I illustrate my invention in the accompanying drawings which, with theletters of reference marked thereon, form a part of this specificationand in which:

Figure 1 is a side elevation.

Fig. 2 is a central longitudinal sectional view through the same.

Fig. 3 is a cross sectional View centrally through the snap hook.

Fig. 4 is a view showing the parts disassembled.

Reference now being had to the details of the drawings by letter:

A designates the shank portion of a hook B and which shank portion is ofcylindrical outline and provided with a longitudinal recess adapted toreceive the plug C which is slotted to receive the pin D having a head Dseated in the recessed walls of the slot of said plug and which has athreaded aperture E therein. A coiled spring F is mounted about said pinand has one end held against the bottom of the recess in the shankportion A and its other end is passed through an aperture H formed inthe pin. A spring N has a widened portion N seated in a recess formed inthe outer face of said plug and said spring is held in place by means ofa screw 0 passing through an aperture in the widened portion of theshank portion of the spring and also the shank portion A of the hook.The inner end of the spring has a lug Q which is adapted to engage therecess R formed in the end of the cylinder T which telescopes over thecylindrical portion A of the shank of the hook B. A screw L is passedthrough registering apertures in the shell and also through the threadedaperture in said pin and the shank A, adjacent to said screw L, isrecessed away as at A to permit the shell and shank portion to haveslight axial movements one independent of the other suflicient torelease the pivotal hook S, which is pivotally mounted upon a pin Scarried in the slotted contracting end of the shank portion A.

In operation, when the parts are assembled as shown in Fig. 1 of thedrawings, the hook S is held in a locked position within the sleeve. Itwill be noted that when the hook S is in a locked relation it is held bythe lug upon the inner end of the spring against the inner surface ofthe sleeve. When it is desired to release the hook, a partial axialrotary movement is given to the sleeve and when the end of the hook Scomes in registration with the slot in the end of the sleeve the springwill throw the hook loose and the lug engaging the recess in the sleevewill hold the latter and the shank portion of the hook from furtherrotary movement. To look the hook, the operation is reversed, the end ofthe hook S being placed against the lug and partial revolution given tothe sleeve, which will throw the hook to a locked position.

What I claim to be new is:

1. A safety snap hook comprising a hook having a cylindrical shankportion, a spring fastened to said shank portion and having a resilientend with a lug thereon, a sleeve journaled upon the shank' portion ofthe hook, a spring actuated pin mounted in a recess in the shank of thehook, a screw passing through apertures in the sleeve and engaging anaperture in said pin, said sleeve having a slight axial movementindependent of said shank upon which it is mounted, one end of thesleeve adapted to receive said lug, and a pivotal hook mounted upon theend of said shank portion, and adapted to be depressed against said lugand when the sleeve is given partial revolution to be held by the sleevein a locked relation.

2. A safety snap hook comprising a hook screw passing through saidapertures, and an aperture in said pin, a hook pivoted 'to theprojecting end of said shank portion adapted to be held by said lugagainst the 15 inner surface of the sleeve.

In testimony whereof I hereunto afiix my signature in presence of twowitnesses.

. PRYORL. PLANK. Witnesses C. A. MOORE, M. W. E. ALLEN.

with a cylindrical shank portion which is recessed, a plug mounted insaid recess, a headed pin mounted in a slot in the plug, a coiledspring, one end fastened to the pin and the other to said shank portionof the hook and provided with an aperture, a spring fastened to saidplug in said shank portion and having a resilient end with a, lugthereon, a sleeve journaled upon said shank portion provided with arecess in one end, and oppositely disposed apertures, a

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of iatents,

Washington, D. G. o

